$(function(){
	getRem(750,100);
	$("body").show();
})
window.onresize = function(){
    getRem(750,100);
};
function getRem(pwidth,prem){
    var html = document.getElementsByTagName("html")[0];
    var oWidth = document.body.clientWidth || document.documentElement.clientWidth;
    html.style.fontSize = oWidth/pwidth*prem + "px";
    console.log("根元素fontSize-->"+oWidth/pwidth*prem + "px");
}
